DieChecker, on 21 January 2013 - 03:50 AM, said:

I think the slower you move the closer you get to time standing still. So if you don't move at all then lunchtime seems to take forever to arrive.

When you are at a standstill, you travel through time at the speed of light from a stationary observer's point of view.

As you travel quicker and quicker, the slower you travel through time to a stationary observer (or, at least, to someone moving more slowly than you). So if you are on a spaceship travelling at the speed of light, anyone outside the spaceship who is somehow able to get a quick glimpse into the spaceship through the window would see time on your spaceship at a complete standstill. However, you yourself wouldn't notice that time has slowed on your spaceship. You will, however, see time passing extremely quickly outside your spaceship when you look through the window. So, when you step out of your spaceship, it could well be that half an hour has gone by in your spaceship from your point of view, but 100 years have gone by on Earth.

That's because space and time are linked. In other words, if you are at a standstill, you move through time at the speed of light from the point of view of a stationary observer.

If you travel at the speed of light, you would have ceased travelling through time at all from the point of view of a stationary observer.

If you travel at half the speed of light, then a stationary observer would perceive you as travelling through time at half the speed of light, and so on and so on.

Imagine space-time as a scale of 1-100, and if you increase one to, say, 40, the other has to go down to 60, etc etc.

The best way to imagine this effect is to imagine that you are on a train and you have a clock. Attached to the side of the clock is two mirrors facing each other. Imagine there is a photon of light bouncing from one mirror to the other (for the sake of convenience imagine you can see this photon of light) and the photon hits a mirror once every second, causing the second hand to move forward one second, every second as normal.

You on the train would see this photon bouncing up and down and hitting a mirror once every second. So, to you, time is passing as normal.

Then imagine that your train goes at high speed through a station. There is a man on the station platform and, as your train passes from left to right from his point of view, he sees you through the window of the train holding your clock. He, however, would see the clock and its two mirrors moving from left to right with the train. He would also see the photon not moving just up and down but also moving left to right at the same time - to him it would be a zig-zagging motion that it's making. So he would see the photon hitting one mirror but then he would notice that by the time it hits the next mirror that mirror has moved several feet to the right by the time the photon hits it. So, to him, the photon has to travel a further distance through the air for it to hit that next mirror to make the clock advance a second. He notices that it takes three seconds for it to travel this extra distance to make the second hand of the clock tick one second.

So this means that whilst a second has just gone by for you on the train, the guy looking at you through the window would actually have perceived that one second for you as three seconds from his perspective.

**Edited by TheLastLazyGun, 21 January 2013 - 03:17 PM.**